Elysian Shadows

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#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
int main (int argc, char *argv[])
{
	const int SCREEN_WIDTH = 640;
	const int SCREEN_HEIGHT = 480;
	const int TILE_WIDTH = 32;
	const int TILE_HEIGHT = 32;
	bool done = false;
	bool output = false;
	bool topLeftCorner = false;
	bool bottomRightCorner = true;
	int mouseX = 0;
	int mouseY = 0;
	int x = 0;
	int y = 0;
	int w = SCREEN_WIDTH;
	int h = SCREEN_HEIGHT;
	int topLeftY = 0;
	int topLeftX = 0;
	int bottomRightY = 0;
	int bottomRightX = 0;
	SDL_Surface *buffer = NULL;//creates the buffer
	SDL_Surface *grass = NULL;//creates the buffer
	SDL_Init(SDL_INIT_VIDEO);
	buffer = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 32, SDL_SWSURFACE);
	SDL_Event event;
	
	SDL_WM_SetCaption("Tile", NULL);
	grass =  IMG_Load("grass2.png");
	while(!done)
	{
	if( event.type == SDL_MOUSEBUTTONDOWN)
    {
        //Get the mouse offsets
	
        mouseX = event.motion.x;
        mouseY = event.motion.y;
		if (topLeftCorner == false)
		{
		topLeftX = mouseX;
		topLeftY = mouseY;
		printf ("tlX is %d tlY is %d \n", topLeftX,topLeftY);
		topLeftCorner = true;
		}
		if (bottomRightCorner == false )
		{
		bottomRightX = mouseX;
		bottomRightY = mouseY;
		printf ("brX is %d brY is %d \n", bottomRightX,bottomRightY);
		printf ("tlX is %d tlY is %d \n", topLeftX,topLeftY);		
		bottomRightCorner = true;
		}	
	if (output == false)
	{
	output = true;
	printf ("mouseX is %d mouseY is %d \n", mouseX,mouseY);
	}
	event.type = NULL;
     } 
	SDL_FillRect(buffer,NULL,0x000000);
		for (int i = y; i <h; i+=TILE_HEIGHT)
		{	
			for (int j = x; j<w; j+=TILE_WIDTH)
			{
			SDL_Rect area = { j, i, TILE_WIDTH, TILE_HEIGHT};				
			SDL_BlitSurface( grass, NULL,buffer , &area );
			}
		}
	SDL_Flip(buffer);
	Uint8 *key = SDL_GetKeyState (NULL);
		if (key[SDLK_ESCAPE])
		{
		done = true;
		}
		if (key[SDLK_l])
		{
		grass =  IMG_Load("grass2.png");
		}
		if (key[SDLK_s])
		{
//* this is testing code to see if the math is right
//will not work when topLeftY is at 80.
		topLeftX = 0;
		topLeftY = 40;
		bottomRightX = 132;
		bottomRightY = 100;
//*/
		x = topLeftX;
		y = topLeftY;
		w = (bottomRightX - topLeftX);
		h = (bottomRightY - topLeftY);		
		}
		if (key[SDLK_c])
		{
		if (topLeftCorner == true && bottomRightCorner == true)
		{
		bottomRightCorner = false;
		}
		output = false;
		}
		while(SDL_PollEvent(&event))
		{
			if (event.type == SDL_QUIT)
			{
				done = true;
			}
		}	
	}
SDL_FreeSurface(grass);
	SDL_Quit();
	return 0;
}